tencent cloud


Last updated: 2024-05-21 15:05:29
    Before entering the room or during the call, you can check the user's network quality to determine the current network quality. If the user's network quality is too poor, it is recommended that the user change the network environment to ensure normal call quality.
    This article mainly introduces how to implement network quality detection before the call or during the call based on the NETWORK_QUALITY event.

    Detect network quality during the call

    const trtc = TRTC.create();
    trtc.on(TRTC.EVENT.NETWORK_QUALITY, event => {
    console.log(`network-quality, uplinkNetworkQuality:${event.uplinkNetworkQuality}, downlinkNetworkQuality: ${event.downlinkNetworkQuality}`)
    console.log(`uplink rtt:${event.uplinkRTT} loss:${event.uplinkLoss}`)
    console.log(`downlink rtt:${event.downlinkRTT} loss:${event.downlinkLoss}`)

    Detect network quality before the call

    Implementation process

    1. Call TRTC.create() to create two TRTCs, referred to as uplinkTRTC and downlinkTRTC.
    2. Both TRTCs enter the same room.
    3. Use uplinkTRTC to push the stream, and listen to the NETWORK_QUALITY event to detect the uplink network quality.
    4. Use downlinkTRTC to pull the stream, and listen to the NETWORK_QUALITY event to detect the downlink network quality.
    5. The entire process lasts for about 15 seconds, and finally takes the average network quality to roughly determine the uplink and downlink network conditions.
    The process of checking network quality incurs a small basic service fee. If a resolution is not specified, the stream will be published at a resolution of 640 x 480.

    API Call Sequence


    Sample Code

    let uplinkTRTC = null; // Used to detect uplink network quality
    let downlinkTRTC = null; // Used to detect downlink network quality
    let localStream = null; // Stream used for testing
    let testResult = {
    // Record uplink network quality data
    uplinkNetworkQualities: [],
    // Record downlink network quality data
    downlinkNetworkQualities: [],
    average: {
    uplinkNetworkQuality: 0,
    downlinkNetworkQuality: 0
    // 1. Test uplink network quality
    async function testUplinkNetworkQuality() {
    uplinkTRTC = TRTC.create();
    roomId: 8080,
    sdkAppId: 0, // Fill in sdkAppId
    userId: 'user_uplink_test',
    userSig: '', // userSig of uplink_test
    scene: 'rtc'
    uplinkTRTC.on(TRTC.EVENT.NETWORK_QUALITY, event => {
    const { uplinkNetworkQuality } = event;
    // 2. Detect downlink network quality
    async function testDownlinkNetworkQuality() {
    downlinkTRTC = TRTC.create();
    roomId: 8080,
    sdkAppId: 0, // Fill in sdkAppId
    userId: 'user_downlink_test',
    userSig: '', // userSig
    scene: 'rtc'
    downlinkTRTC.on(TRTC.EVENT.NETWORK_QUALITY, event => {
    const { downlinkNetworkQuality } = event;
    // 3. Start detection
    // 4. Stop detection after 15s and calculate the average network quality
    setTimeout(() => {
    // Calculate the average uplink network quality
    if (testResult.uplinkNetworkQualities.length > 0) {
    testResult.average.uplinkNetworkQuality = Math.ceil(
    testResult.uplinkNetworkQualities.reduce((value, current) => value + current, 0) / testResult.uplinkNetworkQualities.length
    if (testResult.downlinkNetworkQualities.length > 0) {
    // Calculate the average downlink network quality
    testResult.average.downlinkNetworkQuality = Math.ceil(
    testResult.downlinkNetworkQualities.reduce((value, current) => value + current, 0) / testResult.downlinkNetworkQualities.length
    // Detection is over, clean up related states.
    }, 15 * 1000);

    Result Analysis

    After the above steps, you can get the average uplink network quality and the average downlink network quality. The enumeration values of network quality are as follows:
    The network condition is unknown, indicating that the current TRTC instance has not established an uplink/downlink connection
    The network condition is excellent
    The network condition is good
    The network condition is average
    The network condition is poor
    The network condition is extremely poor
    The network connection has been disconnected. Note: If the downlink network quality is this value, it means that all downlink connections have been disconnected.
    When the network quality is greater than 3, it is recommended to guide the user to check the network and try to change the network environment, otherwise it is difficult to ensure normal audio and video call. You can also reduce bandwidth consumption through the following strategies:
    If the uplink network quality is greater than 3, you can reduce the bitrate through the TRTC.updateLocalVideo() interface or close the video through the TRTC.stopLocalVideo() method to reduce uplink bandwidth consumption.
    If the downlink network quality is greater than 3, you can reduce the downlink bandwidth consumption by subscribing to a small stream (refer to: Enable Small Stream Transmission) or only subscribing to audio.
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